参数资料
型号: MIC2186YM TR
厂商: Micrel Inc
文件页数: 8/15页
文件大小: 0K
描述: IC REG CTRLR BST FLYBK CM 16SOIC
标准包装: 2,500
PWM 型: 电流模式
输出数: 1
频率 - 最大: 440kHz
占空比: 85%
电源电压: 2.9 V ~ 14 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 16-SOIC(0.154",3.90mm 宽)
包装: 带卷 (TR)
其它名称: MIC2186YMTR
MIC2186YMTR-ND
MIC2186
V IN
C IN
Micrel, Inc.
C DECOUP
V IN A 1
V IN P
L1
V REF
16
EN/UVLO
7
Bias
On
V DD
D1
V OUT
V DD
SKIP
2
HiDC
13
Freq/2
Control
P GND
OutN
14
Q1
C OUT
15
Sync
11
Osc
Current
Reset
50mV
CSH
Soft Start
9
3
Skip Current
Limit Comparator
R SENSE
COMP
P GND
P GND
12
4
V REF
1.245V
R1
V REF
8
V DD
10
V REF
V DD
Hysteresis
Comparator
± 1%
V fb
6
R2
S GND
S GND 5
Figure 2. MIC2186 SKIP Mode Block Diagram
The description of the MIC2186 controller is broken
down into 6 basic functions.
? Control Loop
? PWM Operation
? SKIP Mode Operation
? Current Limit
? MOSFET gate drive
? Reference, enable & UVLO
? Oscillator & Sync
? Soft start
Control Loop
PWM and SKIP modes of operation
The MIC2186 can operate in either PWM (pulse width modu-
lated) or SKIP mode. The efficiency of the boost converter
can be improved at lower output loads by manually selecting
the skip mode of operation. The potential disadvantage of
skip mode is the variable switching frequency that accompa-
nies this mode of operation. The occurrence of switching
pulses depends on component values as well as line and load
conditions. PWM mode is the best choice of operation at
higher output loads. PWM mode has the advantages of lower
output ripple voltage and higher efficiencies at higher output
loads. Pulling the SKIP pin (pin 3) low will force the controller
to operate in PWM mode for all load conditions. Pulling the
SKIP pin high will force the controller to operate in SKIP
mode.
M9999-042205
8
April 2005
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